landform of Andes Mountains

...Peru, the Cordillera Occidental runs parallel to the coast, while the Cordillera Real from Bolivia ends in the rough mountain mass of the Vilcanota Knot at latitude 15° S. From this knot (
nudo), two lofty and narrow chains emerge northward, the Cordilleras de Carabaya and Vilcanota, separated by a deep gorge; a third range, the Cordillera de Vilcabamba, appears to the west of...